Improvement in machine for making- joints in table-leaves



gatwt use Y www s JOHN RICHARDS, CIl\lCll\ll\l./YI`IJ ASSIGNOR TO HIMSELF AND J. N. VBRIT'IINGHAM, OF COLUMBUS, OHIO.

Letters Patent No. 88,331, dated .Ma/rch 30, 1869.

IMPROVEMENT'IN MACHINE FOR MAKING- .TOIN'TS IN TABLE-LEAVES.

The Schedule referred to in these Letters Patent and making part of the am To all 'wh-om these letters come Be it known that I, JOHN RICHARDS, of Cincinnati, in the county of Hamilton, and Statel ot' Ohio, have invented a new and useful Machine for Forming J oitits for Table-Leaves, commonly known as rule-joints; and

I do hereby declare the following to be a full, clear, and

exact description of the same, reference being had to the'drawings accompanying and forming part of this specification, in which- Y Figure l is an end elevation;

Figure 2, a side view of the same;

Figure 3 is a diagram of a joint as moulded by this machine, or-'made by hand; and l Figure 4, a diagram of a joint as heretofore moulded by machinery.

The nature of this invention consists .in moulding the jointsoftable-leaves, commonly called rule-joints, by means oi'rotary cutter-heads, whose axis is arranged to operate,at an angle with the face of the piece; andV in so constructing a machine that a joint can be formed similar to that made by hand-planes, which has not Ybeen heretofore attained in machines constructed for this worlr.

The di'erence between the hand-made joint and machine-made joint is shown in the diagrams, figs. 3 and 4, iig. 3 being the form or'. the joint as made by handplanes, and iig. 4, the machine-made joint.

-Attempts to mould these joints have not generally been successful, and but little advantage has heretofore been derived from the use of machinery for the purpose, the popular idea being that it could only be moulded by hand. l

lo enable others skilled in the art to make and use -my invention, I will proceed to describe the mode of constructing and manner of operating the same, referring to the drawings.

A is a frame, upon which is mounted a travelling carriage, b, gibbed onat O, and constructed to slide eely upon -tbe top of A, and` is moved by means of hand-wheel E, connected with a screw extending the whole length of A, and having a lbearing at f.

g g are cutter-heads, with a profile, to t the mould required, and are represented as made from solid steel, which is a sui-table manner of making them, although they can be made with detached cutters.

h is the bed, or central part of a common table-top, and ll, a leafadapted to the same.

m m are clamping-bars, to hold the pieces firmly upon the supports n n, and are formed slightly convex p p are gum springs, that serve to raise the clampbars m m, when the wheels o o are loosed and the pieces li and t' removed.

On the carriage b are mounted the boxes, or spindlesupports q q and spindle fr, as shown. This spindle having'cutters at both ends, arranged to work the bed and leaf, as shown, makes one complete joint at each operation.

The spindle lr has a position at right angleswith the tangential lines cl a', shown in the diagram.l g. 3, aocomplished in the machine illustrated, by means ofthe incline supports n n, by arranging them in this relative position.

The shoulder at b', fig. 3, can be worked beyond the `centre line al', g. 3, and the leaf E' hung proportioncover the hinge shown in The spindle fr is driven by a belt, as shown in red lines in iig. 1, the belt travelling on a drum, S, which has suicient length to accommodate the movement of carriage b.

. The manner of operating the machine will be 'clear enough from the foregoing description.

The pieces h and 'l are clamped, as shown, and the carriage b moved by hand-wheel E, as will be understood.

Having thus described the nature of my invention, its objects, and the mapner of attaining them,

p What I regard as new, and desire to secure by Let ters Patent, is-

l. The bevelled cutter-heads g g, in combination with the travelling carriage b, arranged to operate in v 'the manner and for the purposes set forth.

2. The combination of the travelling carriage b, inclined supports u, and spindle r, operating as herein specified and for the purposes described.

JNO. RICHARDS.

Witnesses: i

W. S. KELLEY, H. W. FORGEY. 

